QDK PIC24/dsPIC-XC16 - Quantum Leaps

QDK
PIC24/dsPIC-XC16
www.state-machine.com/pic
6.2 The BSP header file bsp.h
The BSP header file for the DPP application defines the desired ticking rate. This constant is useful for
defining timeouts, which are always specified in units of clock ticks:
#define BSP_TICKS_PER_SEC
100U
void BSP_init(void);
void BSP_displayPhilStat(uint8_t n, char const *stat);
void BSP_displayPaused(uint8_t paused);
. . .
6.3 BSP initialization
The following BSP_init() function for the Microstick II board configures the DSP and peripherals as,
shown in Listing 11. This file has been designed to be easily modifiable for other applications. The notable
element is configuring the FRC (Fast RC Oscillator) clock by setting the flash word 2. Of course, the clock
configuration can be different in your projects, but it must be consistent with the settings for various
peripherals, such as timers, UARTs, etc.
Listing 11: The BSP_init() implementation in the bsp.c for the DPP example.
_CONFIG2(FNOSC_FRC); /* set flash configuration for the device */
. . .
void BSP_init(void) {
RCONbits.SWDTEN = 0; /* disable Watchdog */
TRISA = 0x00; /* set LED pins as outputs */
PORTA = 0x00; /* set LEDs drive state low */
}
if (QS_INIT((void *)0) == 0) { /* initialize the QS software tracing */
Q_ERROR();
}
6.4 Starting Interrupts in QF_onStartup()
QP invokes the QF_onStartup() callback just before starting the background loop. The
QF_onStartup() function must configure and start interrupts. At the minimum, QF_onStartup() must
start the system clock tick interrupt. The following QF_onStartup() function enables the CPU Timer 0.
void QF_onStartup(void) { /* entered with interrupts locked */
T2CON = 0x0000U; /* Use Internal Osc (Fcy), 16 bit mode, prescaler = 1 */
TMR2 = 0x0000U;/* Start counting from 0 and clear the prescaler count */
PR2 = (uint16_t)(BSP_TMR2_PERIOD – 1.0 + 0.5); /* Timer2 period */
_T2IP = TIMER2_ISR_PRIO; /* set Timer 2 interrupt priority */
_T2IF = 0; /* clear the interrupt for Timer 2 */
_T2IE = 1; /* enable interrupt for Timer 2 */
T2CONbits.TON = 1; /* start Timer 2 */
}
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